Topic: Different behaviour in IE and FF

I posted this in the Pro forum yesterday but it's a problem with the free version. Sorry.


I embedded simple viewer V2.0.1 in my homepage lately (www.gvtb.ch -> Galerie). My problems:

- Firefox 3.5.7 only shows white X instead of the pictures / thumbs
- IE8 shows the pictures fine

BUT:

- Firefox can open the selected picture in a new window (although it previousely appeared as white X)
- IE can't open the selected picture in a new window (it comes up with an error message: 403 Forbidden)

Somehow weird, isn't it?! Does anybody have similar problems? What am I doing wrong (doctype, meta, server settings, ..)? I am a bit lost. Thanks for your help!